Tidy up github actions #6914

Job	Run time
Build & test (hydra-plutus)	21m 4s
Build haddock using nix	1m 9s
Build & test (hydra-tui)	23m 0s
Build & test (hydra-node)	23m 12s
Build & test (hydra-tx)	21m 51s
Build specification using nix	1m 33s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	2m 8s
Build & test (hydra-cluster)	25m 0s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 34s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/1-node.json datasets/3-nodes.json --outpu...	4m 0s
Compute cost differences	3m 16s
Publish benchmark results	4s
Documentation	3m 12s
Publish test results	21s
	2h 11m 24s

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